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I just wish they'd properly categorise the different options and publish the criteria.
This would prevent all the trial and error that we've all had to go through to end up with settings we're happy with. For example, Hippy would be able to specifically check what road type the A40 and A44 are classified as and adjust his settings accordingly.
Does something like that exist?
hazzelfrazzel-
I think it will do for OSM, probably not the Garmin maps. This is the OSM info on road classifications https://wiki.openstreetmap.org/wiki/Routing
aggi
I can't find the link to where it was explained but basically the roads on a map have different weighting according to how cycle friendly they are (i.e. major A roads score badly, cycle lanes score well) and the more cycle friendly a road you request, the more emphasis will be given to this weighting.
If you choose to minimise distance/time then more weighting is given to these factors. Choose Automobile routing and then car weighting will come into play.
Different maps, e.g. OSM, talkytoaster, Garmin Official, may have different ranking for different roads.